12/25/2023 0 Comments Vga connector resolutionLaptops utilise VGA technology to connect and display media content to an external monitor or a projector.VGA can be used to connect a PC to a monitor.The VGA technology is utilised for many different purposes. The VGA offers 16 colours at its 640*480 resolution colour display, while there’s also an option to increase the number of colours to 256, by lowering the resolution to 320*200. It has even seen a resurgence lately due to an increase in retro gaming. Video Graphics Array, developed by IBM, was a popular media transmitting technology in the late 90s. The VGA developed by IBM was the first of its kind that introduced people to the magic that media on big screens can offer. Given the available level of technology and expertise available, the connector is capable of only reading and converting the analog signal, which refers to the lower resolutions and lower quality visualisation on the big screens. The one last thing, but I would be surprised that is the problem, would be that the protocol used by your display device is not known by the computer.In 1987, IBM developed a 15-pin connector called Video Graphics Array and took the first step in revolutionising the entire process of displaying and visualising the media on a bigger screen. Otherwise, it would be a repeater that increases the signal midpoint (or maybe 2 of those at 1/3rd each.) Having a driver to which you can teach what you are connecting to and force the output to X/Y/Z is probably the easiest solution in your case, although every person would have to install that driver. Since it works with some computers, they may have a better signal (higher voltage that can carry further) than the computers that fail. In general, the driver will use a safe fallback if it cannot determine the resolution of the display device. Since you mentioned using a rather long cable, I'm actually thinking that the serial connection may not work right. Wikipedia has a quite good page on the DDC and the different protocols: I think you guessed it, what happens is the driver that checks the monitor using the DDC which is a simple serial connection (most often still not shown in VGA connector diagrams!) If you think this is better suited to SuperUser, please move it, but this is framed from an IT standpoint of something that affects a real pool of users in a multiple conference room, 50+ deployed laptop scenario. I've seen HDMI start artifacting more over same-length, same gauge cabling (up to 50' run in certain rooms). for situations where my users end up using VGA anyway, it's preferable for display mirroring if they can output their laptop's native resolution, which, you guessed it, is very often 1080p on 15" models.ĭISCLAIMER: This is primarily a curiosity, I'm not claiming 1080p over VGA is ideal by any means, but hey, if it works. Why do I care? Well if there's some way I could enable it. Now, this wouldn't be surprising at all except SOME laptops have no issue outputting 1080p over VGA, even with lower native resolutions. The basic reason for the question is that I noticed, say, a ThinkPad W520 with 1080p built in display, will output 1080p fine over DisplayPort to a 1080p projector, but will cap out at 1600x1200 (practically the same pixel count, just a little shy) on VGA. I'm thinking this will come down to either a video driver that says it supports only certain resolutions for output, or limitations of the RAMDAC (which wouldn't be in play, at least DAC wise, on a digital output, but WOULD on VGA, an analog output). What determines what resolutions a laptop is willing to output over VGA? Specific example: a ThinkPad W530 will do 1080p, a W520 won't, over VGA. Also to my surprise, VGA outputs over 1080p on a 50ft cable run with very minimal degradation on certain laptops - other laptops just don't offer 1080p as a resolution choice and top out at 1600x1200 or something else. Contrary to what I expected, people seem to have much more trouble with the HDMI than VGA, so VGA gets used a lot more than you'd think (even as most workstation laptops made in the last 3-4 years have DisplayPort or Mini-DisplayPort.). HDMI for DisplayPort and Mini-DisplayPort, and VGA as a fallback, universal option. I'm responsible for several conference rooms and have setup 1080p projectors and I provide both HDMI and VGA connectivity.
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